<?php

namespace PHPExcel\Shared;

/**
 * PHPExcel_Shared_Drawing
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category PHPExcel
 * @package PHPExcel_Shared
 * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
 * @version ##VERSION##, ##DATE##
 */
class Drawing {
    /**
     * Convert pixels to EMU
     *
     * @param int $pValue
     *            Value in pixels
     * @return int Value in EMU
     */
    public static function pixelsToEMU($pValue = 0) {
        return round($pValue * 9525);
    }
    
    /**
     * Convert EMU to pixels
     *
     * @param int $pValue
     *            Value in EMU
     * @return int Value in pixels
     */
    public static function EMUToPixels($pValue = 0) {
        if ($pValue != 0) {
            return round($pValue / 9525);
        } else {
            return 0;
        }
    }
    
    /**
     * Convert pixels to column width.
     * Exact algorithm not known.
     * By inspection of a real Excel file using Calibri 11, one finds 1000px ~ 142.85546875
     * This gives a conversion factor of 7. Also, we assume that pixels and font size are proportional.
     *
     * @param int $pValue
     *            Value in pixels
     * @param \PHPExcel\Style\Font $pDefaultFont
     *            Default font of the workbook
     * @return int Value in cell dimension
     */
    public static function pixelsToCellDimension($pValue, \PHPExcel\Style\Font $pDefaultFont) {
        // Font name and size
        $name = $pDefaultFont->getName();
        $size = $pDefaultFont->getSize();
        
        if (isset(\PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size])) {
            // Exact width can be determined
            $colWidth = $pValue * \PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size]['width'] / \PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size]['px'];
        } else {
            // We don't have data for this particular font and size, use approximation by
            // extrapolating from Calibri 11
            $colWidth = $pValue * 11 * \PHPExcel\Shared\Font::$defaultColumnWidths['Calibri'][11]['width'] / \PHPExcel\Shared\Font::$defaultColumnWidths['Calibri'][11]['px'] / $size;
        }
        
        return $colWidth;
    }
    
    /**
     * Convert column width from (intrinsic) Excel units to pixels
     *
     * @param float $pValue
     *            Value in cell dimension
     * @param \PHPExcel\Style\Font $pDefaultFont
     *            Default font of the workbook
     * @return int Value in pixels
     */
    public static function cellDimensionToPixels($pValue, \PHPExcel\Style\Font $pDefaultFont) {
        // Font name and size
        $name = $pDefaultFont->getName();
        $size = $pDefaultFont->getSize();
        
        if (isset(\PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size])) {
            // Exact width can be determined
            $colWidth = $pValue * \PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size]['px'] / \PHPExcel\Shared\Font::$defaultColumnWidths[$name][$size]['width'];
        } else {
            // We don't have data for this particular font and size, use approximation by
            // extrapolating from Calibri 11
            $colWidth = $pValue * $size * \PHPExcel\Shared\Font::$defaultColumnWidths['Calibri'][11]['px'] / \PHPExcel\Shared\Font::$defaultColumnWidths['Calibri'][11]['width'] / 11;
        }
        
        // Round pixels to closest integer
        $colWidth = (int) round($colWidth);
        
        return $colWidth;
    }
    
    /**
     * Convert pixels to points
     *
     * @param int $pValue
     *            Value in pixels
     * @return int Value in points
     */
    public static function pixelsToPoints($pValue = 0) {
        return $pValue * 0.67777777;
    }
    
    /**
     * Convert points to pixels
     *
     * @param int $pValue
     *            Value in points
     * @return int Value in pixels
     */
    public static function pointsToPixels($pValue = 0) {
        if ($pValue != 0) {
            return (int) ceil($pValue * 1.333333333);
        } else {
            return 0;
        }
    }
    
    /**
     * Convert degrees to angle
     *
     * @param int $pValue
     *            Degrees
     * @return int Angle
     */
    public static function degreesToAngle($pValue = 0) {
        return (int) round($pValue * 60000);
    }
    
    /**
     * Convert angle to degrees
     *
     * @param int $pValue
     *            Angle
     * @return int Degrees
     */
    public static function angleToDegrees($pValue = 0) {
        if ($pValue != 0) {
            return round($pValue / 60000);
        } else {
            return 0;
        }
    }
    
    /**
     * Create a new image from file.
     * By alexander at alexauto dot nl
     *
     * @link http://www.php.net/manual/en/function.imagecreatefromwbmp.php#86214
     * @param string $filename
     *            Path to Windows DIB (BMP) image
     * @return resource
     */
    public static function imagecreatefrombmp($p_sFile) {
        // Load the image into a string
        $file = fopen($p_sFile, "rb");
        $read = fread($file, 10);
        while ( !feof($file) && ($read != "") ) {
            $read .= fread($file, 1024);
        }
        
        $temp = unpack("H*", $read);
        $hex = $temp[1];
        $header = substr($hex, 0, 108);
        
        // Process the header
        // Structure: http://www.fastgraph.com/help/bmp_header_format.html
        if (substr($header, 0, 4) == "424d") {
            // Cut it in parts of 2 bytes
            $header_parts = str_split($header, 2);
            
            // Get the width 4 bytes
            $width = hexdec($header_parts[19] . $header_parts[18]);
            
            // Get the height 4 bytes
            $height = hexdec($header_parts[23] . $header_parts[22]);
            
            // Unset the header params
            unset($header_parts);
        }
        
        // Define starting X and Y
        $x = 0;
        $y = 1;
        
        // Create newimage
        $image = imagecreatetruecolor($width, $height);
        
        // Grab the body from the image
        $body = substr($hex, 108);
        
        // Calculate if padding at the end-line is needed
        // Divided by two to keep overview.
        // 1 byte = 2 HEX-chars
        $body_size = (strlen($body) / 2);
        $header_size = ($width * $height);
        
        // Use end-line padding? Only when needed
        $usePadding = ($body_size > ($header_size * 3) + 4);
        
        // Using a for-loop with index-calculation instaid of str_split to avoid large memory consumption
        // Calculate the next DWORD-position in the body
        for($i = 0; $i < $body_size; $i += 3) {
            // Calculate line-ending and padding
            if ($x >= $width) {
                // If padding needed, ignore image-padding
                // Shift i to the ending of the current 32-bit-block
                if ($usePadding) {
                    $i += $width % 4;
                }
                
                // Reset horizontal position
                $x = 0;
                
                // Raise the height-position (bottom-up)
                $y++;
                
                // Reached the image-height? Break the for-loop
                if ($y > $height) {
                    break;
                }
            }
            
            // Calculation of the RGB-pixel (defined as BGR in image-data)
            // Define $i_pos as absolute position in the body
            $i_pos = $i * 2;
            $r = hexdec($body[$i_pos + 4] . $body[$i_pos + 5]);
            $g = hexdec($body[$i_pos + 2] . $body[$i_pos + 3]);
            $b = hexdec($body[$i_pos] . $body[$i_pos + 1]);
            
            // Calculate and draw the pixel
            $color = imagecolorallocate($image, $r, $g, $b);
            imagesetpixel($image, $x, $height - $y, $color);
            
            // Raise the horizontal position
            $x++;
        }
        
        // Unset the body / free the memory
        unset($body);
        
        // Return image-object
        return $image;
    }
}
